header{
    margin: 0 auto;
    width: 100%;
    /*width: 500px;*/
    text-align: center;
    /*font-family: Microsoft YaHei;*/
    font-family: Arial;
}

header h1{

    font-size: 40px;
    font-weight: bold;
}

#newGameButton{
    display: block;
    margin: 10px auto;
    /*margin: 20px auto;*/
    padding: 10px;
    width: 100px;
    background-color: #8f7a66;
    color: white;
    border-radius: 10px;
    text-decoration: none;

}

#newGameButton:hover{
    background-color: #9f8b77;
}

#score{
    font-size: 25px;
    margin: 20px auto;
}

main{
    width: 460px;
    height: 460px;
    padding: 20px;

    margin: 50px auto;
    background-color: #bbada0;

    border-radius: 10px;
    position: relative;
}

.cell{
    width: 100px;
    height: 100px;
    border-radius: 6px;
    background-color: #ccc0b3;
    position: absolute;
}

.number-cell{
    border-radius: 6px;
    font-weight: bold;
    font-size: 60px;
    line-height: 100px;
    text-align: center;

    position: absolute;
}
